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Nucleation is an out-of-equilibrium process, which can be strongly affectedby the presence of external fields. In this letter, we report a simpleextension of classical nucleation theory to systems submitted to an homogeneousshear flow. The theory involves accounting for the anisotropy of the criticalnucleus formation, and introduces a shear rate dependent effective temperature.This extended theory is used to analyze the results of extensive moleculardynamics simulations, which explore a broad range of shear rates andundercoolings. At fixed temperature, a maximum in the nucleation rate isobserved, when the relaxation time of the system is comparable to the inverseshear rate. In contrast to previous studies, our approach does not require amodification of the thermodynamic description, as the effect of shear is mainlyembodied into a modification of the kinetic prefactor and of the temperature.

Extension of Classical Nucleation Theory for Uniformly Sheared Systems